/* 返回顶部 */

div.toTop {
  width: 60px;
  height: 60px;
  position: fixed;
  bottom: 100px;
  right: 20px;
  border-radius: 2px;
  background-color: rgba(28, 31, 33, 0.50);
  text-align: center;
  line-height: 60px;
  display: none;
  cursor: pointer;
}

div.toTop a {
  font-size: 34px;
}